{
  "document": {
    "category": "security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "publisher": {
      "category": "vendor",
      "contact_details": "support@arista.com",
      "name": "Arista PSIRT",
      "namespace": "https://www.arista.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Security advisory 213 canonical URL",
        "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25035-security-advisory-0213"
      }
    ],
    "title": "Security Advisory 213",
    "tracking": {
      "current_release_date": "2026-11-08T09:58:20Z",
      "generator": {
        "engine": {
          "name": "Arista Networks SecEng Service CSAF Generator"
        }
      },
      "id": "Arista Networks Security Advisory 213",
      "initial_release_date": "2026-11-08T09:58:20Z",
      "revision_history": [
        {
          "date": "2026-11-08T09:58:20Z",
          "number": "1",
          "summary": "Document created"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "product_version",
                    "name": "EOS version 4.35.7",
                    "product": {
                      "name": "EOS version 4.35.7",
                      "product_id": "CSAFPID-5"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.22.1",
                    "product": {
                      "name": "EOS version 4.22.1",
                      "product_id": "CSAFPID-6"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.36.3",
                    "product": {
                      "name": "EOS version 4.36.3",
                      "product_id": "CSAFPID-0"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.33.11",
                    "product": {
                      "name": "EOS version 4.33.11",
                      "product_id": "CSAFPID-1"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.37.0",
                    "product": {
                      "name": "EOS version 4.37.0",
                      "product_id": "CSAFPID-2"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.34.9",
                    "product": {
                      "name": "EOS version 4.34.9",
                      "product_id": "CSAFPID-4"
                    }
                  }
                ],
                "category": "product_name",
                "name": "EOS"
              }
            ],
            "category": "product_family",
            "name": "Software Products"
          }
        ],
        "category": "vendor",
        "name": "Arista Networks, Inc."
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-121286",
      "id": {
        "system_name": "Arista Bug ID",
        "text": "1975990"
      },
      "notes": [
        {
          "category": "description",
          "text": "On affected platforms running Arista EOS in multi-agent routing model with BGP Segment Routing Traffic Engineering (SR-TE) address family configured, a BGP peer can send crafted BGP packets to cause the BGP process to restart, disrupting all BGP sessions on the device.",
          "title": "CVE Description"
        },
        {
          "category": "other",
          "text": "In order to be vulnerable to CVE-2026-121286, the following condition must be met:\n\nBGP must be configured, and either SR-TE IPv4 or SR-TE IPv6 address family is configured and there's at least one BGP neighbor activated in IPv4/6 SR-TE AFI/SAFI.\n\n```\nswitch# show bgp sr-te summary\nBGP summary information for VRF default\nRouter identifier 192.0.2.2, local AS number 100\nNeighbor Status Codes: m - Under maintenance\n  Neighbor         V  AS           MsgRcvd   MsgSent  InQ OutQ  Up/Down State  PfxRcd PfxAcc\n  192.0.2.1        4  100          407       413      0    0   00:18:57 Estab  1      1\n  2001:DB8::1      4  100          407       413      0    0   00:18:57 Estab  1      1\n\n```\n\n```\nswitch# show ip bgp neighbors 192.0.2.1\n  BGP version 4, remote router ID 192.0.2.1, VRF default\n  Negotiated BGP version 4\n  ...\n  Neighbor Capabilities:\n    Multiprotocol IPv4 Unicast: advertised and received and negotiated\n    Multiprotocol IPv4 Segment Routing Traffic Engineering Policy: advertised and received and negotiated\n    Multiprotocol IPv6 Segment Routing Traffic Engineering Policy: advertised and received and negotiated\n```",
          "title": "1975990: Required Config for Exploitation"
        }
      ],
      "product_status": {
        "first_affected": [
          "CSAFPID-6"
        ],
        "fixed": [
          "CSAFPID-0",
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-4",
          "CSAFPID-5"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "MITRE ",
          "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-121286"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.33.11",
          "product_ids": [
            "CSAFPID-1"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.34.9",
          "product_ids": [
            "CSAFPID-4"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.35.7",
          "product_ids": [
            "CSAFPID-5"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.36.3",
          "product_ids": [
            "CSAFPID-0"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.37.0",
          "product_ids": [
            "CSAFPID-2"
          ]
        },
        {
          "category": "none_available",
          "details": "Not fixed in EOS version 4.22.1",
          "product_ids": [
            "CSAFPID-6"
          ]
        },
        {
          "category": "mitigation",
          "details": "For complete mitigation guidance and assistance, customers are advised to contact the Arista Networks Technical Assistance Center (TAC) for support."
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0",
            "CSAFPID-4",
            "CSAFPID-6",
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-5"
          ]
        }
      ],
      "title": "CVE-2026-121286"
    }
  ]
}